Mount for incandescent-lamp filaments



'June 22 1926.

v v I 1,590,164 E. L. HARRINGTON AL MOUNT FQR INCANDESCENT LAMP FILAMENTS Filed May 26, L920 INVE NTOR I GNP/"amen ATTORNEY Patented June 22, 1926.

" UNITED STATES- PATENT OFFICE.

ERTLE L. HARRINGTON, OF BLOOMFIELD, AND GODFREY'K. PREISER, 0F ORANGE. NEW JERSEY, ASSIGNORS TO WESTINGHOUSE LAMP COMPANY, A CORPORATION OF PENNSYLVANIA.

MOUNT FOR INCANDESCENT-LAMP FILAMENTS.

Application filed. May 26,

This invention relates to types of mounts for the filaments of electric incandescent lamps, particularly those in which the filaments are operated at very high temperatures, as in incandescent lamps that are utilized as light sources in projection apparatus or systems. m/

In the'presentfor of construction embodied in incandenscent lamps used for projection purposes, it is customary to rigidly sup-port the filament at a plurality of points, such as where the pitch of the coiled sections comprising the filament has been made relatively coarse,-as, for example, between the closely wound sections and the term nals.

Inasmuch as the operating temperature of the filamentof a lamp, of this type is very high, there is a considerable elongation of the coiled sections for which compensation 'must be provided in order to prevent the several sections from warping or buckling out of their plane of mounting and thus seriously impairing the unifornilty'ot' the light derived from the lamp, as usually manipermit the segments comprising the filament tested by light and dark spots upon a screen.

.This displacement of the filament may be in several directions and of a rotary nature.

It is an object of this invention to overcome the above difficulty by the provision of a filament mount or support that will to naturally expand and contract by reason of forces of thermal or other origin acting thereupon.

Another object of the invention is to provide a form of filament support which will permit freedom of expansion of the segments comprising the filament and direct or control this expansion along the lines of gravity.

Another object of the invention is to so mount the filament that the lines of force acting thereupon shall be in a given direction and substantiallyin a single plane.

A still further object of the invention is the provision of a filament mount or support that will confine the movement of the filament to a selected direction or plane but will permit freedom of motion in the desired or 192a Serial No. 384,279.

necting links may be firmly secured to the;

filament and, to each other in such a manner as to prevent the rotation oii the several sections constituting the filament.

In the accompanying drawings, Fig. 1 is an elevation of a filament supported in a pendant position and provided with means for permitting the elongation and contrac- -tion thereof in a rectilinear path coincident with the force of gravity; Fig. 2 is alike view of a modification of the mounting shown-1n Fig. 1; Fig. 3 1s an elevation of a filament so mounted that all motions, of

whatever nature, excepting those in a rectilineardirection, are restrained; Fig. 4 is a similar view of a modified form of the construction shown in Fig"; 3, and Fig. .5 is an elevation of a form of mounting coming within the invention and in which the ex-' pansion of the filament is in an upward di-. rection with respect to the base of the lamp.

Throughout the several views of the drawings, similar reference characters refer to like parts.

A more detailed understanding of the in-.

oppositely disposed. Gonstituting a part of the stem 2, and juxtapositioned relative to the .leading-in conductors 1, is a. glass arbor 4, the end of which is enlarged to provide means for inserting, in a vertical position, helical guide members 5. An over head cross piece 6, preferably spot welded to'the leading-in conductors 1 but electrically insulated therefrom by glass insulators or heads 7, has downwardly extending therefrom a supporting link 8 which is adapted ,to each other in sucha manner as to occupy substantially the same plane. The spaces intermediate the several coils are substanticontaining the same.

allv equal in width to the diameter of the coils.

The filament 9 is'provided with terminals 11 which are secured to the ends of the curved portions 3 of the leading-in conductors. The terminals 11 are preferably made of sulficient length to prevent the temperature of the coiled sections adjacent thereto from being materially different from that of the intervening sections becauseof the heat being more rapidly conducted away by the leading-in conductors.

Connecting links-12 are attached to the lower coarse turns of the filament 9 and are adapted to reciprocate in the guide members The links 12 are of sufficient rigidity and .length to atford a means for partially supporting the tilament t) and, at the same time, permit it to freely expand and contract under forces created by the temperature changes to which the filament and its mount are subjected in the use of the lamp In this form of con struction, the movement of the filament is restrained to a rectilinear path corresponding in direction to the force of gravity.

The modification shown in Fi 2 is similar to the style of mounting shown in Fig. 1, the difference residing in the specific method of supporting the filament 9 and in the form of guide members 5 which are provided for accommodating the links 121. In this construction, each of the guide members 5 comprises a pair of anchors, one end of each of which is inserted in a glass or lava block 13 supported from the side of the corresponding leading-in conductor 1, while. its other end is provided with an eyelet adapted to receive the corresponding connecting link 12. The eyelets of the respective pairs of anchors constituting the guide members are in alignment with the links 12.

In F i 3 the suspension of the filament is somew iatdifi'erent from that disclosed in Figs. I and 2, but is also of the pendant type. In this construction, the guide. members 5 comprise oppositely disposed lava blocks 13 supported fromthe sides of the leading-in conductors. are pierced longitudinally to. permit the passage therethrough ofithecoiinecting links 12. Thel nds of t e un 1.2 are'b ni The lava blocks 13 thereof.-

at right angles toward each otherand are inserted into a. lava bridge piece 14. Inasmuch as the top ends of the connecting links 12 are rigidly fastened to the filament 9, which is also true of theconnecting link 8, the coiled sections, although permitted to move in a rectilinear path, are prevented from rotating by virtue of the links 8 and 12.

In the modification shown in Fig. 4, which is similar to thel mounting illustrated in Fig. 3, the bridge piece (3 is dispensed with anl the filament 9 is supported by having the terminals thereof bent at right angles to the coiled sections and welded to the leading-in conductors 1. The intervening segments are supported, at the top, by a hook 15, one end of which may be inserted in a glass pedestal 16 comprising a part of the stem 2 and the otherend thereof attached to the coarse turn joining "the central coiled sections. 1

The connecting links 12 extend through a single pierced lava block 17 that is supported from one of the leading-in conductors. One end of each of the connecting links is fixed to the filament while the other end is provided with oonvolutions 18 adjacent to its connection to the pedestal 16. The function of the convolutions 18 is to provide resilient means for allowing the filament to expand and contract. v

In Fig. 5 the mounting is of the type :which may be termed an overhead con struction, which is characterized by the filament being supported above the ends of the leading-in conductors. The terminal .por-

.tions of the filament are secured to the ends tion, one end of the supporting link 8 is inserted into the glass pedestal 16 and its other end is secured to the filament 9.

From the above description, it will be apparent.that, in the various mountings described, the filament is free to expand and contract in-a rectilinear path, thereby greatly lessening the. tendency of the filament to warp or twist'out of its normal plane. This restraint may be further exercised by providing means, such as shown, for arresting any rotary movement of the filament, with the result that a more uniform light source may be obtained from the lamp embodying the filament.

While this invention has been setforth in certain preferred embodiments, it will be understood that modifications may be made without departure from the spirit and scope m is claimed is:

1. In an incandescent electric lam'p mount,

a coiled, filament supported therefrom in a pendent position, said filament being composed of several sections, and means for restricting all the motions of said filament caused by temperature changes excepting those movements which may take placeina predetermined path said means/including guide members and links, the latterbeing connected to said filament, said guide members beirigconnectedwith said links ina; 'Ihaniier'to permit substantially only recip rocating motion of said links Within said guide members, the former being fixedly secured to 'the; mova'ble" portion of said filament and t eaeho aer in a manner to prevent oscilla" ory movement of the sections of said filament. 1

2. A filament mount of the pendant type comprising a frame having uprightsupporting members'originating in a" glass stem and connected by an overhead cross-piece,

wai'dly curved portions oppositely disposed, a glass support juxtapos'itaoned relative to said. supporting members, upwardly fextendmg tubular guide members secured to said glass support, a filament consistingiof several closely coiled sections separated by portions of relatively coarse pitch and-provided with straight terminal portions, saId-jer-Q minal portions being attached to the curved portions of the filament supporting members, a link carried by said cross-piece for supporting the segments intermediate the terminal segments, and connected links adapted to reciprocate Within said guide members and restrain in a rectilinear path the movement of the several filament sections due to expansion and contraction.

3. A mount for an incandescent electric lamp comprising a stem, supporting members extending in approximately an axial diplurality of coiled sections, separated. by a' rection therefrom, afilament consisting of a said supporting members terminati'ng'in in- 4 terminedpath. f

relatively straight portion, disposed substantially parallel and provided With terminal portions connected to the supporting members, a tubular guide member supported by means of the stem and a link connected to an intermediate portion of the filament, for

restraining distortion thereof and adapted -from in axpendent position, said filament beinglcomposed of severatsections, link members ponnec-ted at the r normal upper ends to said filament, a non-conductive coupling for unitingithe lower ends of said links and "guide members operating in conjunction twith the connected links to confine the moveuiientoflsaidfilanient sections to a predetermined path: v i

\ tn'An incandescent lamp mount, comprisa coiled filament supported therefromin osition,said 'filamentibeing composedgof s veral sectigns, link members con- 'nebtedaigtheinnormal upperends to said filament, a nijn cofiductive'coupling uniting the lotve'r 'elfdsiof 1 said-links',-guide. members disposed substantially intermediate the filament/ and said coupling and operating "in corijunetio with the links to confine-rthe' move- 85- mentof aid sections of'filamenttoa prede- In testimony whereof, Wehave hereunto subscribed our nameSQthis tWenty-first day of May, 1920.

- ERTLE L.'HARRINGTON-.

-GODFR.E ,Y K PREICER 

